. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. ENCHYTR^ID^ 49 as the spokes in a wheel, and between the strands are a number of small unicellular glands opening near the pore. Besides these very small glands, there are also a dozen or more larger glands which rise high above the muscular strands (pi. viii, fig. 5), and which seem to open near to the apex of the penis. There are thus three sets of glands opening in connection with the sperm-ducts : atrial glands and two kinds of penial glands, the smaller of wliich do not rise above the muscular strand mentioned above. The
. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. ENCHYTR^ID^ 49 as the spokes in a wheel, and between the strands are a number of small unicellular glands opening near the pore. Besides these very small glands, there are also a dozen or more larger glands which rise high above the muscular strands (pi. viii, fig. 5), and which seem to open near to the apex of the penis. There are thus three sets of glands opening in connection with the sperm-ducts : atrial glands and two kinds of penial glands, the smaller of wliich do not rise above the muscular strand mentioned above. The funnels are thick and helix-like (fig. 22, <5), and taper very gradually into the sperm- ducts. The sperm-sacs are long and thick, extending from the ventral to the dorsal side of the ccslom. Nephridia (fig. 23) are round v/ith two principal folds with rounded outlines. The duct leading to the pore is thick and hclix-like. Lyfnphocytes few in number, of disc-like form, and quite small. Intestine.— The intestine, both posterior and anterior to clitellum, is covered with a thick coating of brown chloragogen cells. MESENCHYTIMEUS FUSCUS INERMIS var. nov. pi. I, fig. 18; text-fig. 24. Definition.— Length about 20 mm., width about i mm. Somites 75. Setae sigmoid : laterals ; 3, 4, 3, o, 5, 6, 5, 6, 6, 7, 6, 5 (4, 3, 2) ; ventrals ; 4, 5, 6, 5, o, 6, 6, 4, 6, 7, 6, 5 (5, 4). Head-pore halfway between apex and the first groove. Clitellum ventrally and dorsally ^ XI-XIII. Sexual papillae not large. Sep- tal glands in IV to VI. Brain as in the species, but less emarginated anteriorly. Dorsal vessel rises in somite XXI. Intes- tine narrower in II and III. Spermatheca with two diverticles near the base, each being two-elevenths as long as the whole spermatheca. Sperm-ducts about twelve times as long as the length of the funnel. Funnel more slender than in the species. An atrium present, in which open four to six glands near its junction with the penis. Penial glands open near the
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